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- W2950005556 abstract "Localizing touch relies on the activation of skin-based and externally defined spatial frames of reference. Psychophysical studies have demonstrated that early visual deprivation prevents the automatic remapping of touch into external space. We used fMRI to characterize how visual experience impacts the brain circuits dedicated to the spatial processing of touch. Sighted and congenitally blind humans performed a tactile temporal order judgment (TOJ) task, either with the hands uncrossed or crossed over the body midline. Behavioral data confirmed that crossing the hands has a detrimental effect on TOJ judgments in sighted but not in early blind people. Crucially, the crossed hand posture elicited enhanced activity, when compared with the uncrossed posture, in a frontoparietal network in the sighted group only. Psychophysiological interaction analysis revealed, however, that the congenitally blind showed enhanced functional connectivity between parietal and frontal regions in the crossed versus uncrossed hand postures. Our results demonstrate that visual experience scaffolds the neural implementation of the location of touch in space.SIGNIFICANCE STATEMENT In daily life, we seamlessly localize touch in external space for action planning toward a stimulus making contact with the body. For efficient sensorimotor integration, the brain has therefore to compute the current position of our limbs in the external world. In the present study, we demonstrate that early visual deprivation alters the brain activity in a dorsal parietofrontal network typically supporting touch localization in the sighted. Our results therefore conclusively demonstrate the intrinsic role that developmental vision plays in scaffolding the neural implementation of touch perception." @default.
- W2950005556 created "2019-06-27" @default.
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- W2950005556 date "2017-09-25" @default.
- W2950005556 modified "2023-10-14" @default.
- W2950005556 title "Visual Experience Shapes the Neural Networks Remapping Touch into External Space" @default.
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- W2950005556 doi "https://doi.org/10.1523/jneurosci.1213-17.2017" @default.
- W2950005556 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6596542" @default.
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- W2950005556 hasPublicationYear "2017" @default.
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